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https://issues.apache.org/jira/browse/HIVE-827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754829#action_12754829
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Namit Jain commented on HIVE-827:
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It is actually backed my persistent disk, so there is no correctness issue, but
most of the applications may be able to use a higher default value
> increase hive.mapjoin.cache.numrows default value
> -------------------------------------------------
>
> Key: HIVE-827
> URL: https://issues.apache.org/jira/browse/HIVE-827
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
> Attachments: hive.827.1.patch
>
>
> Currently, it is 10000 and leads to bad performance
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